Watermelon

Nothing beats the sweetness of a perfect watermelon. In addition to the classic red-flesh type, look for yellow flesh, seedless, or cantaloupe-size mini varieties. They're all full of vitamins C and A, plus cancer-fighting lycopene.

Choose a firm, symmetrical watermelon that feels heavy. Store uncut on the counter for up to a week. After cutting, cover and refrigerate, but not for longer than a few days (it'll get mushy).